Final answer:
When joining 3 tables in a SELECT statement, typically 2 join conditions are required to link all tables together properly.
Step-by-step explanation:
When joining 3 tables in a SELECT statement, the number of join conditions needed in the WHERE clause is typically 2. This is because each join condition serves to link two tables together on a common attribute, and when you have 3 tables, you need to link the first table to the second, and then link the second table to the third, resulting in two join conditions.
It is possible to consider different join strategies, such as using JOIN clauses instead of the WHERE clause, but the fundamental requirement would still be two conditions to properly link all tables in a three-table join scenario.
When joining 3 tables in a SELECT statement, 2 join conditions are needed in the WHERE clause. The join conditions specify how the tables are related to each other. For example, if Table A has a foreign key that references Table B's primary key, and Table B also has a foreign key that references Table C's primary key, then you would need to provide join conditions for both join operations.
Switching between tables is necessary to establish the connections between the tables and retrieve the desired data. By specifying the join conditions in the WHERE clause, you can instruct the database on how to merge the records from the different tables based on the specified relationships.